Automatic feed for an air-drill



E. H. CHAPMAN. AUTOMATIC FEED FOR AN AIR DRILL. APPLlc/Irlou mso occ.ls. Isla.

Patented Jan 25, 1921.

4 SHEETS-SHEET I A TTU/WHS Nv Il. l Im Ill@ E. H. CHAPMAN.

AUTOMATIC FEED FOR AN AIR DRILlf..

APPLxcATIoN FILED DEC. I8. 1918.

1,366,716, Patented Jan. 25, I.

4 SHEETS-,SHE

@V2-2. F/GJ.

0//3-3 Fal E. H. CHAPMAN. AUTOMATIC FEED FOR AN AIR DRILI.. vAPPLICATIONmen DEC. LB. 191s.

1,366,716. V Patented Jan. 25,1921.

4 SHEETS-SHEET 3.

A TTHNEYS E. H. CHAPMAN.

AUTOMATIC FEED FOR AN AIR DRILL. APPLICATIUN FILED DEC. 18, 19|8.

1,366,716. Patented Jan. 25,1921.

4 SHEETS-SHEET 4.

ATTORNEYS UNITED STATES :EDWARD n. CHAPMAN, or BEfriiLErrnivr-l,rnNNsYLvanrA.

AUTOMATIC FEED FOR AN' AIR-DRILL.

Y Specification of Letters llatent.

Patented, Jari. 251.192,41.

Application ler ecember 18, 1918. Serial No. 27,343.

To all whom t may concern.'

Be it lrnoivn that I, EDWARD H. CHAPMAN, a citizen of the United Statesresiding at Bethlehem, in the county of horthampton, State ofPennsylvania, have-invented a nenT and useful Automatic Feed forAir-Drills, of which the following is a specification.

My invention relates in general to the class of automatic drill feedattachments for airand electric drills, or drill presses of varioustypes, in which provision is. made for automatically feeding the` drillinto the -Work and for disconnecting the feed mechanism Withoutaffecting the rotary movement of the drill.

More particularly my invention relates to an automat-ic portable feedfor drills invented by me and forming the subject-matter of UnitedStates Letters Patent No. 1,202,030, granted to me October 24,19l6,--and, While possessing all of the advantages of myaforesaid feed,comprehends certain improvements in the organization and application tothe drill-spindle and gearing which drives said spindle, of the motivemechanism which operates upon the' gearing to effect the control of thedrill-spindle relatively to the feed screw.

My invention possesses all of the advan tages which inhere in theportable feed of my patent, and in addition includes a differently.balanced and arranged casing for containing the motive mechanism andalso the gears Wwhich control the operation 0f the drill-spindle andtheY feed screw, so that the assembly as such is better arranged forcertain types of drills, and calculated to be more particularlyapplicable to a. motor driven. drill as contra-distinguished from onethat is portable and operatedby hand.

While all the advantages of my patented feed and the details of itsconstruction, which my patent aforesaid comprehends and particularlyclaims, are presentin' this new and useful embodiment of them, I have inaddition to the organization and balanced arrangement of the casing,devised certain improvements in the organization, application,control'and form of the rocker arm which controls the movements. of oneof the idle gears relatively to one of the driving gears and also themovements of a second idle gear and a second driving gear which in thisinvention as` well as inthat of my patent, cooperate with the iirstnamed gears.

For the purpose of illustrating my invention, l have shown in theaoco-mpanying drawingsT certain types and embodiments, of 1t which are,at present` preferred by me4 be.- cansein practice they have been foundto give satisfactory and reliable results. It is to be understood,however, that the,v various instrumentalities in which myA inyentionfi'sembodied can be` variously arranged and organized and that my inventionYis not therefore limited to the precise arrangement and organization ofthese instrumentalities which are typied in the constructions,illustrated in the accompanying drawings and hereinafter described., iRefer-ring to the' drawings y- Fignre 1 represents a vertical, central,sectionalelevation of a drill embodyingmy inventionf-Vcertain partsbeing represented in brolren side elevation.

Fig. .2 represents a section on the line 2 2, Figs. l and 5.

Fig. 3 vrepresents a section on the linevv 8MS@ Figs. l and 5. n n nFig. 4E represents a left-hand end elevation of the machine of Fig. l,the'casing of the motor being indicated in dotted lines.

Fig. 5 represents a section on the dotted line 5-5 of Fig. ai, showingtivo sets of feed gears and means for engaging and disengaging them,certain parts being omitted for the salte of clearness of illustration.i

Fig. 6 represents a bottom plan view of one of the idle gears.

Fig. T represents an edge,y view of the` gear of Fig. 6. L i

Fig. 8 represents an inside view .ofy the casting which is used as a capto inclose the motor casing as shown in Eig. l.

Fig. 9 represents a. section on line 9.-9 of Eid. 8. i i

Fia, 10 represents the gear sleeve with a portion of the drill-spindlein broken out'- line. i Fig. 1l represents an inverted central sectionof the cap ofthe motor casing which is shown in Fig. 8, removed from thecasing.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings- 1 represents a casing, being a housing of theform shown in full lines in Fig.V 1 and in dotted lines in Fig. 4:, thepeculiar form, organization and application of this casing beingdescribed late/ron.

Nithin the casing areA the cylinders 2 Within which are the pistons 3,and also the roo connecting rods 3X for the cranks 4 of the crank shaft5, assembled and mounted in the manner usual in motors of this characterand which are typical of motive mechanism generically considered, andadapted through a pinion 6 on the right-hand crank shaft 5, to occasionthe rotation of a gear or spur wheel 7 mounted on the hollow drillspindle 8.

9 designates the Vcylindric upper or outer portion of a'r'otatable feedscrew, the eX- ternally threaded portion of which is designated 10, 'andthe threads of which may be of a predetermined number and pitch, en-

gaging with internal threads 11 formed within the hollow drill spindle 8which eX- tends longitudinally of the easing within a cylindric borethereof, the upper bearing surface of which bore is designated 13, themiddle 14, and the lower 15. Y

The feed screwY 9 1() at the end opposite A to the drill socket 12 isprovided with a conical center 16, retained'by a cap 17 and providedwith a ball race 18 intermediate the end of the feed screw and the tip,the latter being adapted to engage a suitable abutment oiold man 19,Fig. l, said center serving when held stationary, to permit of the freerotation of the feed screw.

The drillspindle or drill-carrying meinber is rotatable within thebearine surfaces 13, 14 and 15, of the bore, and a bail race 20intei'venes between the shoulder 21 of said spindle and the middlebearing 14 of the bore.

rl`he lower end of the feed screw is formed with a pintle 22v which inthe downward or outwa rdrmovement of the feed screw enters within asocket 23 formed within the drillspindle, so as to stop the'outwardmovement of the feed screw.v

The outer or lower end of thedrill-spindle 4terminates in the usualdrill socket 12 within which the drill,ibit, or other implement (notshown), engages.

The organization so far described is that embraced in the constructionof Fig. 1 of my patent referred to, and the rotation of thedrill-spindle 8, in the operation of the tool, is occasioned by theagency of compressed air, or other motive duid, applied to a typicalmotor of the character illustrated in A Figs. 1 and 4,-or by anelectrically operated meten-.either operating through the spur wheel andpinion 6 to edect the rotation of the crank shaft 5.

l rlhe rotation of said drill-spindle is transmitted to the'feed screwthe following manually-actuated supplemental controlling gearing, whichalsov is illustrated and particularly described `in connection with theconstruction of Fig. 2 of my said patent, and also in a somewhat similararrangement in connection with the construction of F ig. 1. lt is hereto be explained that in the organization of my present drill, the casingas an entirety is of such a construction that the motive mechanism isdisposed in opposition to lthe gearing, in coiitradistinction to adisposition in relative alinement therewith as in the organization ofFig. 1 of my hereinbefore-mentioned patent. For this purpose the casingto be later described presents the disposition shown in Figs'. 1 and 4.

Referring now te the feed-gearing organization which in the presentinstance l utilize for the operation of my drill, 25 is a feed-gearkeyed to the drill spindle 8. rThis feed-gear 2o iieshes with an idlegear 2G, freely revoluble upon a gear stem 27, housed in the cap member28A of the casing 1, see 1 and 11, and in parallelism with thedrill-spindle 8 and feed screw 9-10l This Vgear stem 27, as hereinafterexplained, is similar in constructionto a second and parallel gear stem29.

T he gear stem 27 is susceptible of vertical movement within bearingsand 31 within the cap member 28, and above the idle gear Y 26 it carriesa vertically movable, rcveluhle driving gear 32, retained in place uponthe stem by and between two collars 53 and if he stem 2T entends aboveand beyond the cap member 28 and is provided with a head or push-button35. @the driving gear 32 is adapted to engage with a driven gear 3G, seeparticularly Figs.

1 and 10, formed on the inner end of a hol low, cylindric sleeve 37terminating in a* hand wheel 38, and adapted to turn freely on the feedscrew, as shown in Fig. 1.

rllhis sleeve extends upwardly or voutwardly beyond the cap Vmember 2Sof the casing, and while encompassing the smooth portion 9` of the feedscrew, encompasses also the upper threaded portion 10 of said feedscrew, upon which it is reveluble, so

Vas, at will, through the intervention of a feather 56 hereinafterreferred to, toV make it possible manually to turn the feed screw. Thedriven gear 36 and the sleeve 37 are a unit, and the gear member is inconstant engagement or meshed with the drivinon gear 32.

rixiallyparalleling the gear stem 27 is a similarly mounted second gearstem 29,A upon which are mounted another idle gear 41, being acounterpart of the idle `gear .26,

and also another driving gear 42 above said idle gear 41, being acounterpartk of the driving gear32.

Both the driving gears 32 and 42 have bottom clutching faces,respectively designated'l).X and 42X and rboth of the idle gears 26 and41 have upper clutching faces, respectively designated 26X and 41X, sothat according to the lifting and dropping movement of the gear stems 27and 29, one or the other ofthe idle gears 26 or 41, both of which are inmesh with the feed gear25 on mesme the drill-spindle 8, will be engagedwith the driving gear 32 or 4t2 with which it coperates.

.Each of the gear stems 27 and 29 is formed with a transverse slot,respectively designated 43 and 44, whose Walls are en gaged by the endsof a rocker arm 4:5 pivoted at 46 within the cover top 47 of the capmember 28.

ln order to hold the gear stems in their relative opposite positions,when, for instance the gear stem 29,-'shown in Fig. in its elevatedposition,-is raised, l provide said gear stem 29 with two notches ankupper designated 48, and a lower designated 4:9, into one or the otherof which a locking ball or device 50 is adapted under the pressure of aconfined spiral spring 51, to be entered. V

The first gear stem 274is shown as provided with but a single notch 52,into which a locking ball or device 53 controlled by a spring 54. isadapted to be entered. Obviously, a pressure upon the head or pushbutton 35 of the` stem 27 will force down said stem, and through theroclrer arm l5 force up the stem 29 into the position shown in F 5,while a depression upon the push button 55 will occasioneJ reversal ofposition of the parts. temporary holding together' of either idle gear26 and driving gear 32, or of idle gear Ll1 and driving gear d2, iseffected.

inasmuch as, according to the desired direction of rotation of thedrill-spindle 8, either the driving gear 32 or the driving gear i2 is,through the clutch of its idle gear, operatively engaged with the drivengear 36 on the thumb sleeve 8; and inasmuch, further, as both of theidle gears 26 and ll are always in engagement with the feed gear 25 onthe drill spindle 8, it is obvious, broadly stated, that the right-handor left-hand rotation of the drill spindle and drill, will beaccomplished by the manual movement or pushing in of one of the gearstems to effect the clutching` of the driving gear and the idle gearwith which it oper' ates.

56 is a feather or spline in the sleeve 37 and sliding in a featherway57 longitudi nally recessed partly in the exterior of the feed screw9-10 and partly in the interior cf the sleeve 37, so that in therotation of the driven gear 36 and sleeve in one or the otherdirections, the feed 'screw will be correspondingly rotated.

58 is a bearing washer and spacer encircling the feed screw andseparating the driven gear 3G and the driving gears 82 and 42.

Referring now to the casing l, its organi'fzatioay far as it comprehendsa cas ing as such for a motive mechanism and as it appears inFig. l, isa matter of large Thus the locking andV importance, and while thedetails of construction shown in Fig. larewell suited for for thepurpose, I do not necessarily conline myself to them. It is, however7 ofthe essence of my present construction that such portion of the casingas embraces the motive mechanism should be upon a given side of Jthedrill spindle and feed-screw and that the other portion of said casingWithin which is confined the manually-controlled supplemental drivinggearing should be upon another side, so as to make a double 'compartmentand, `so to speak, balanced, casing.

The entire casing and the componentl members of it, in which the motivemecha nism is contained is designated by the number l and its details ofconstruction are apparent from Fig. l.

That Vportion of the casing, however, which is upon the opposite side ofthe drillspindle and feed screw l have designated as lx, and its detailsof construction also will be understood from Fig. l.

The casing as an entirety is however, at the end opposite thedrill-holding end l2 of the drill spindle 8, confined and inclosed by acap member 28 which is shown in beth Figs. 1 and l1, in Fig. 1l removedfrom the casing proper.

This cap member 28 is preferably a casting embodying a chamber 59 ofcylindric form, within which are assembled the driving` ygears 32 and42, the idle gears 2S and 41, the gear stems 27 and 29, the feed gear 25on the inner end of the drill-spindle 8, and the driven gear 36 on thesleeve 3T.

a cover or top l? incloses the outer end of the chamber 59, and thebearing 13 for the sleeve 37, and also the slide bearings e"lO-31, Fig.5, for the gear stems 27 and 29, are formed in the cap member.

A cap extension 60 extends radially of the axis of the feed screw beyondthat portion of the cap member 28 which contains the chamber 59, toinclose the upper left hand end portion of the casing proper whichconfines the motor, and this extension has formed within it a bearing 6ifor the left hand end of the crank shaft 5.

In the formation of the cap member 28 and its components as justldescribed, l do not of course confine myself to the exact detail of theshapes or contours described but have found them in practice to be advantageous'featnr s of construction.

The operation is as follows z-The object being, as in all drills of thisclass, to advance and retract the drillcarrying member or drill-spindleagainst the resistance of the old man or other abutment, the advance andretraction are accomplished by the rotation in one or the otherdirection of the feed screw. The rotation ofthe drill-spindle throughthe motor geared to iiby the iis Vcontrol the rotation of the feed screwin one or vthe other direction by connected and manually operatedgearing, it will be apparent that because ofthe constant engagement ofthe feed gear 25 with both of the idle gears 26 and' al, one or theother of said idle gears,'-and whichever one it is that for'the timebeing is engaged with either the driving gear 32 or 42,-will occasionthe'rotation of the drivenV gear -35 upon the sleeve 37, which asexplained is in feathered engagement with the feed screw and istherefore capable of turning said feedscrew in either directionaccording to the direction of its own rotation.

From theforegoing association of gears, it will be obviousYthat,tlirough pressure upon either the push-button 35 or thepuslrbutton 55,]one or the other of the driving gears 32 or 42 will belocked with its idleV gear 6 or lll, andthe rotation of either the drilll spindle 8 or the feed screw 9-10 will, in consequence, be accomplishedthrong i the connection between the aforesaid drivine` gears and idlegears with thedriven f 8G feathered through its sleeve 37 to the feedscrew, and also with the feed gear 25 ou une drill-spindle.

VThe revolutions of the drill-spindle are therefore the same as those ofthe feed screw Vand drill and reduction in their relative speeds iseected by the dilference in the number of teeth in the gear 35 and thoseof either 32 or 42. When the reduction is made either through the gear36 and either 32 or 4-2 or through the gear 25and either 26 or 41, thefeed screw is righthanded, with the result that either the gear 35 orthe .gear 25 will have one or several more teeth respectively than thoseof the gears and 4t2 or 26 and il,-tlie relative mimerieal differencebeing calculated for the required speed of revolution.

pifissuming, upon the other hand, the feed screw to be left-handechthenthe gears 82 and 26 and ll2 and lil, will have a greater number of teeththan the gears 3G or bviously, also the feed per revolution will varyaccording to 'the number of threads per inch upon the feed screw,relatively and correspondently, of course, to the number of the internalthreads of the drill-spindle. rlhe operation of returning the drill toits original position after the hole has been bored, is accomplishedthrough the manual operation of one or the other of the gear' stems 27or 29, occasioning the locking of the driving gears and idle gears withwhich said gear stems respectively operate.

In case of a right-handed-screw the return is accomplished through theinstrumentality of the feather 56 andV featherway 57 acting in themanner already fully eX- plained, whereas in the case of a left-handedscrew its return to its originalposition can beV accomplished by thepower of the drill itself, a release of the clutched gears theretoforein action being first accomplished and the thumb sleeve 37 beingmanually held against rotation.

in practice I prefer to employ a lefthanded screw which can be returnedby the power of the instrument.

it will be obvious that by employing gears with relatively dierentnumbers of teeth and by calculating Vthe numbers of threads per inch Vofthe feed screw, any desired revolution of the drill may be obtained.

is already explained, the drill spindle may be rotated by any suitablemedium, as my inventionin its broad aspects is applicable to either arotary piston drill or a reciprocating piston drill, or the rotation ofthe gear spindle may be effected by electricity or any other Vsource ofpower.

lt will now be apparent that I have devised a novel-and usefulconstruction of autoniatic drill which embodies the 'features` ofadvantage einimeratedl as desirable in the statement of the inventionandthe above description, and that while I have, in the presentinstance, shown and described a preferred embodiment which has beenfound in practice to give satisfactory and reliable results, it is to beunderstood that such embodiment is susceptible of modification invarious Vparticulars without departing from the spirit or scope of theinvention or sacrificing any of its advantages.

lrlavingV thus described my invention, what claim as new and desire tosecure by Letters Patent, is :-y

1. A drill comprising in combination,a rotatable drill-carrying member,acasing` for supporting said drill-carryingmem bei-, means forrotating'said drill-carrying member, located within said casing upon agiven side of said drill-carrying-memberrf and 'manually-controlledsupplemental gear-V ing for operating upon said drill-carrying member,located within said casing upon another side of said drill-carryingmember.

2.' in automaticdrill comprising in combination :-adrill-carryingmemben-a feed screw, located axially Within saiddrillcarrying-member.-a casing said drill-carrying-member and said feedscrew,`means for rotating said drill-carrying-member, located withinsaid casing upon a given side of said drill-carrying-memfor supportingbenand manually-controlled supplemental gearing tor operating upon saidfeed screw, located Within said casing uponv another side of saiddrill-carrying-member and said feed screw.

p 3. in automaticdrill comprising in combinationzma rotatabledrill-carryi member having at its inner end a iced arf-a feed screwlocated axially Within said drillcarrying-member and having a drivengear 'feathered to it and to said membeig-a casing for supporting saiddrill-carrying-member and said teed-screm-means for rotating saiddrill-carrying member located Within said casing upon one side oit saiddrillcarrying-member,-and manually-controlled gearing located Withinsaid casing upon another side ot said drill-carrying member and saidfeed screw, which comprises balanced driving gears in engagement Withthe feathered driven gear on the feed t screw, and idle gears inengagement with the feed gear on the drill-carrying-member, either oneof Which is adapted to be clutched to the driving gear with which itcoacts.

a. An automatic drill comprising in combinationz-a rotatabledrill-carrying-member having at its inner end aieed gear rotatable Withit,-a feed screw located axially Within said drill-carrying-member andhaving a driven gear feathered to it and to said member,-a casing itorsupporting said drillcarrying-member and said feed screw-motivemechanism for rotating-said drill-carrying-member located Within saidcasing upon one side of said member,-manually controlled gearing locatedWithin said casing relatively oppositely to said motive mechanism, andcomprisino' a pair of gear stems upon each of Whic is mounted a drivinggear and an idle gear having respectively opposing clutching' yfacedeindmeans for connecting said gear stems so that when one is depressed. theother will be elevated toY ei'iect the relative clutching andunclutching of each pair of gears upon each stem.

5. An automatic drill comprising in combinationz-a rotatable drillcarrying member having at its inner end a feed gear rotatable With it,-afeed screw located axially Within said drill-carrying member and adriven gear Jfeathered to it and to said member,-a casing for supportingsaid drillcarrying member and said feed-screwmotive mechanism i'orrotating said drillcarrying member, located Within said casing upon oneside of said member,-manuallycontrolled gearing located Within saidcasing relatively oppositely to said motive mechanism,` and comprising apair of gear stems upon each of which is mounted a driving gear and anidle gear having respectively opposing clutching facesmeans -forconnecting said gear stems so that when one rsaid Jreed screw in suchmanner is depressed the other Will be elevated to eiiect the relativeclutching and unclutching of each pair ci gears upon each stem,-andautomatic means i'or retaining the gear stems in predetermined differentpositions.

6. in automatic drill of the character described, which comprises incombination a longitudinalljf--extending drillarrying membeig-a feedscrew located axially Within said drill-carrying niemberr-a casingencompassing said drill-carrying member and that their common anisapproximately longitudinally cent-"al of said casingg-means tor rotatingsaid. drill-carrying member, located within said casing to one. side oilbut so as to partly encompass the drill-carving member and theieed-screW,-and manually-controlled supplemental gearing for operatingupon said leed-screw7 oppositely disposed Within the casing withrelad-ionV to the means ntor rotating the drill-carrying member.

7. ln an automatic drill of the character described, the combinationoff-zi drill-carrying' member,-a vfeed screw Within said member,-amotive mechanism to rotate said member,-a manually-controlled gearingfor operating upon said feed screw,- and a casing encompassing both themotive mechanism and the manually-controlled gearing and ot such form as:to support the motive mechanism upon one side of the drillcarryingmember and the gearing upon the other.

8. ln an automatic drill of the character described7 the combinationofz-a drillcarrying member,-a feed screw within said member,a motivemechanism to rotate the drill carrying-member,-a manually-controlledgearing for operating upon said eed-scretv,-and a casing encompassingboth the motive mechanism and the manually-controlledV gearing andformed With a cap member Which incloses the manuallyactuated gearing.

9. In an automatic drill oi the character described7 the combinationo,-a drillcarrying member,-a feed screw Within said member,-a .motivemechanism to rotate said drill-carrying member,-a manually controlledgearing tor operating upon said eed-screvv,-and a casing encompassingboth the motive mechanism and the manually-controlled gearing but uponopposite sides of the drill-carrying member, and formed with a capmember which incloses the manually-actuated gearing and embodies abearing for the outer end ot the drill-carrying member.

l0. ln an automatic drill of the character described,-a casing formed tocontain upon one Vside of its longitudinal center a motive mechanism andupon the other side of said center a gearingf-in combination With adrill spindle extending longitudinally llO through said casing,-a feedscrew Within said drill spindle,-a motive mechanism for said spindle,anda gearing operative upon said feed screw. V

ll. In anV automatic drill of the character describe.d,a casing formedto contain upon* one side of its longitudinal center a motive mechanismand upon the other side of said center a gearing-in combination with adrillspindle extending longitudinally through said oasing,-a feed screwWithin said drill-spindle,-a motive mechanism for said spindle,a gearingoperative upon said feed screw-and means for manually controlling saidgearing. 4

l2. In an automatic drill of the character described,.a casing formed tocontain upon one side ofits longitudinal center a motive mechanism andupon theV other side of said center a gearing-in combination With adrill -spindle extending longitudinally through said casing,a feed screwWithin said drillspindle,-a motive mechanism for said spindle,a gearingoperative upon drill spindle through said casinga-a feed screw Withinsaid drill-,Spindle-a motive mechanism for' said feed screW,-means formanually controlling said gearing-and means for automatically lockingsaid gearing-controlling means.

13. In an automatic drill of the character deserihed,a casing formed tocontain upon one sideof its longitudinal center a motive mechanism andupon the other side of said center a gearing-in combination uwith a.extending longitudinally said spindle,-a gearing operative upon said'lfeed screwmeans foi` manually controlling said gearing,-means forautomatically locking said gearing-controlling meansl-and automaticmeans for retaining the gear stems of said gearing in predetermineddierent positions.

EDWARD H. CHAPMAN.

C. D. MCVAY.

